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7 - Practical ASAT

from Core Section

Published online by Cambridge University Press:  03 March 2022

Thomas F. Kelly ,
Brian P. Gorman  and
Simon P. Ringer
Thomas F. Kelly
Affiliation:
Steam Instruments, Inc.
Brian P. Gorman
Affiliation:
Colorado School of Mines
Simon P. Ringer
Affiliation:
University of Sydney
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Summary

This chapter looks, not at the big picture, but at the details of an operational ASAT instrument. Can specimens withstand repeated STEM/APT cycling? Is an integrated STEM/APT instrument needed or can they be coupled by a vacuum transport? Will specimen evolution models suffice to deliver a realistic model of the specimen shape throughout an ASAT experiment? In an integrated instrument, can APT and STEM be operated simultaneously? Concerns about radiation damage in ASAT experiments and means for mitigating these effects are explored. The role of electron diffraction in ASAT is considered, and it is seen as an important adjunct to atom probe crystallography. The importance of complementary analytical information such as EDS and especially EELS is illustrated. Since atom probe tomography is a compositional mapping tool, EELS as a chemical mapping tool takes on added import. The interplay among the many elements of ASAT and its intrinsic correlative microscopy opportunities serve as an internal check on results. A synergistic ecosystem of AST information with chemical information correlated with physical properties and image simulations defines the opportunity inherent in Atomic-Scale Analytical Tomography.

Keywords

specimen evolution modelstransmission Kikuchi diffractioncontaminationradiolysiscomputational materials science and engineeringsputteringcrystallographyknock-on damageneedle-shaped specimens
Type
Chapter
Information
Atomic-Scale Analytical Tomography
Concepts and Implications
 , pp. 125 - 144
Publisher: Cambridge University Press
Print publication year: 2022

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